Short answer is those mini PCs aren't always the best for real time audio type work. It's more of an office PC or media centre/server system etc. It may struggle with power if you started to throw synths at it.

Unless you have money to spare to experiment i'd take the lack of feedback and available info on the subject as a subtle warning that it may not be a good solution.

Depends what you want to do. Don't forget the spec of the processor is only half the story. It would be using integrated graphics which would load the CPU a bit and I would guess there is little room in there to manage good thermal dissipation so especially if the thing starts to warm up it will throttle quite badly which will kill an audio application. It's not designed for this kind of purpose but would easily manage playing videos, browsing the web etc.

Not to say it wouldn't work for something but I wouldn't expect to run anything major on it, maybe a couple of synths would work.